Threading die



1952 c. H. INGWER ET AL 3 THREADING DIE Filed Sept. 23, 1946 5Sheets-Sheet l IN VE N TORS CARL INGWEI? BY CLYDE E WRIGHT Feb. 5, 1952c. H. INGWER ET AL Tl- READING DIE Z5 Sheets-Sheet 2 Filed Sept. 23.1946 Dun . INVENTORS CARL H. INGWER CLYDE E WRIGHT Feb. 5, 1952 4 c. H.INGWER El AL 2,584,463

I THREADING DIE Filed Sept. 23. 1946 s Sheets-Sheet :5

* Q II All II III I HR I Q 7 INVENTORS CARL h. INGWER CLYDE E. WRIGHTPatented Feb. 5, 1952 UNITED STATES EATENT OFFICE THREADING DIE Carl H.-Ingwer and Clyde E. Wright, Elyria, Ohio Application September 23, 1946,Serial No. 698,667

this type are ordinarily used for threading pip varying from 2%; to 4inches in diameter. Obviously, such a tool was necessarily heavy andcumbersome. It is necessary to lift a tool of this character intdposition each time a pipe is to be threaded as well as to again lift itto re- A move the same from the pipe where it has been threaded. Thefact that these devices were made solely with a View to utility entailedthe use of certain structure which also caused further dif-,

flcultyin handling. The device of the present invention is so designedthat the facility with which it may be handled is greatly increased.

Further, the 1300i Of the present invention is SO constructed that partswhich are subject to wear may be easily and quickly replaced without theaid of special tools.

Another advantage of the evice of this invention resides in the factthat the gear train is completely enclosed, protecting" the workmanagainst injury, retaining the lubricant and preventing the ingress ofdirt, chips or foreign material; Furthermore. an improved cutting actionis afforded, and at the end of the cutting operation, the chasers arewithdrawn from contact with the cut threads; preventing mutilation ofthe threads when the tool is backed ofi of the thread. H

Still other advantages of the invention, and

the inventionitself; will become more apparent by reference to thefollowing description of an embodiment thereof, which description isillustrated by the accompanying drawings and forms a part of thisspecification.

In the drawings:

Fig l is a vertical medial section of a threading tool embodying theinvention; with ertain parts removed from the. work holder to clarifythe invention;

Fig. 2 is an end elevational view of the tool I from the chaser carryingend;

Fig. 3 is an end elevational view of the tool from the work holder endwith the work holder parts place; r

Fig; 4 is an exploded view showin restarts in side elevation.

Referring now to the drawings throughout which like parts are designatedby like reference characters, the device includes a work holder, Figs. 1and 3, which comprises a frame II! of generally, circular conformationand having extending threadedly therethrough screws II and I2, Fig. 3,which project radially toward the axis of the frame. The end of the workholder is of reduced diameter at I3 to provide a bearing for a gaugering [6 which is journalled thereon and held in place by a split ring I5which is seated in a groove I6. The gauge ring is provided with steppedportions adapted for engagement with the heads of the screws I2, toprovide a quick and accurate means for adjusting the holders for thevarious specific sizes of pipe to be threaded.

The work holder is connected by legs I8 to a ring I9 having teeth 2!] onthe periphery which are adapted for driven engagement with a pinion ashereinafter more fully described.

The ring gear I9 is provided with a reduced cylindrical barrel 22, theouter surface of which provides a bearing surface for the housing 23.

The housing 23 comprises a generally cylindrical outer portion adaptedto extend over and protect the ring gear. A pair of handles 24, Fig. 2,extend from opposite sides of the housing which serve as a convenientmeans for lifting the tool.

The housing 23 is provided with an inwardly extending flange 26, theinner periphery of which is adapted to be seated on barrel 22, whichprovides a bearing support therefor. The barrel 7'2 is sufficiently longto extend beyond the flange 26 and is provided with a peripheral groove21, Fig. 4, into which a split ring 28 is snapped. The ring 28 engagesthe outer Surface of the flange 26 to hold the housing in assembledposition relative to the ring gear. At the same time, the housing isfree to rotate on the barrel.

v It will be noted, as best shown in Fig. 1, that the flange 26 isslightly narrower than the space between the split ring 28 and the sideof the ring gear I9 to provide a clearance space 29 which allowsrelative longitudinal movement between the ring I9 and the housing, thepurpose of which will later be explained.

Intermediate the handles 24, at the lower side as viewed in Fig. 1, thehousing is formed with a hollow boss 3! adapted to support and house thedrive pinion 32 and its guide 33. The drive pinion is provided withteeth34 adapted to me h with the teeth 20 on the ring gear, and is carried bya shaft 35 which is provided with a square or exagona driving and 3t.

The end of the shaft 35 may be of reduced diameter at 3? and r'otatablyjournalled in an of dirt or foreign material.

opening provided for it in the end wall of the housing 3|.

The shaft 35 is rotatably journalled in an 011- less sleeve bearing 38which is threaded at 48 adapted to be screwed into a threaded opening inthe housing 3i. The interior of the sleeve is provided with the graphiterings 33' as indicated in Fig. 1. This construction allows the pinionand its shaft to be easily assembled in the housing and to be easilyremoved when desired for replacement when worn. A flange 4| on thesleeve seats in a circular recess around the opening to prevent thesleeve from extending into the housing too far and furnish a sturdysupport for the sleeve when screwed in place.

A flange 42 between the ring gear and the Work holder extends outwardlyin closed spaced relation to the inner wall of the housing 23 to providea guard for the gear and prevent the ingress this flange is in spacedrelation to the housing and does not engage therewith, the sole bearingfor the housing being the barrel 22.

Also supported by the housing are a plurality of chaser control posts44, each of which is secured in the housing flange 25, which is providedwith strengthening bosses 45, best shown in Fig. 4. Each post has acircular base portion 43 which has a press fit with openings in thebosses 45 and the housing wall and is pinned by a pin 4'! to hold thesame securely in place.

The inner face of each post is cut away at 48 to provide an inclinedflat plane surface adapted for engagement with the base end of a chasercarried in the chaser holder. Five such members are shown, but it willbe appreciated that the number may be varied.

The chaser holder comprises a generally circular frame 55 having fiveradially extending bosses on the outer face, the bosses being providedwith radially extending channels in which are disposed the chasers 52.The outer end of each channel is provided with a circular openingthrough which the posts 44 extend. The inner face of the frame 58 isprovided with a circular recess in which the flange 54 of an exteriorlythreaded sleeve 55 is secured to the frame 58 by screws 58 that extendthrough the flange 54 and are in threaded engagement with the frame.

The flange 54 covers the channels which thus l provides guideways forthe chasers. This construction thus provides a convenient and economicalmanner of forming the chaser guide ways, and the removability of thesleeve provides a quick and easy means for replacing the sleeve when itbecomes worn through use or when the threads become damaged.

The inner face of the flange 5 is provided with blind holes 56 in whichbullet catches are disposed, having spring pressed balls 5! adapted toengage in detents in the side of the chaser.

The frame is provided with a hollow boss 5? at its lower end, as viewedin Fig. l, and which is disposed in alignment with the boss 3! on thehousing 23, adapted to receive therethrough the sleeve 38. The sleeve 55is in threaded engagement with the interiorly threaded barrel 22.

In operation, the pipe to be threaded is secured in a vise and the platei4 is adjusted to a position wherein the proper shoulders engage withthe screws i2, which are turned inward until their heads engage theplate. In this position the screws are adjusted to the proper positionto hold the pipe. After the adjustment, the threader is placed with thework holder over the pipe and It is to be noted that i the end of thepipe disposed for engagement with the chasers 52. The screw I! is thenscrewed inward, the three screws securely holding the threader on theend of the pipe.

The pinion 32 is then rotated, through the stem 35, by means of a wrenchdisposed on the squared end 36 of the stem. The stem end 36 is adaptedto receive either a wrench, a ratchet or a power drive as desired. Whenthe pinion is rotated clockwise, it travels around the ring gear I9 andcarries with it the housing 23 which rotates on the barrel 22. Thehousing 23, through the posts 44 and the sleeve 38, rotates the chaserframe 50. The sleeve 55, through its threaded engagement with the barrel22, travels inward toward the pipe, drawing the chasers into threadcutting engagement with the pipe.

When cutting threads, the stem 35 is rotated clockwise which causes thehousing 23 to rotate in a clockwise direction which motion istransmitted to the chaser frame and to the threaded sleeve through theposts 44 and sleeve 38. Since the sleeve 55 and chaser frame 58 becauseof their threaded engagement with the housin ring gear 20-22 are beingpulled toward that gear, and since there will be considerable frictionbetween the frame 50 and the posts 44 and sleeve 38, the housing 23,therefore, urged by the friction on the posts 44 and sleeve 38, willmove towards the ring gear causing the flange 26 to abut the inner faceof the ring gear closing the gap 29, the flange 26 being moved away fromthe snap ring 28. During this first movement, the chasers and the postsmove together until the gap 23 is closed, cutting a straight thread on.the pipe.

The power is applied continuously until the desired number of threadsare cut on the pipe. Each revolution of the chaser frame causes thesleeve to be threaded further into the barrel 22, and after the gap 29is closed, since the chaser frame moves inward relative to the housing,the posts 44 slide through the chaser frame; and the chasers, which abutthe inclined surface 48, gradually recede to cause the proper taper ofthe threads being cut.

When the desired threads have been cut, the direction of rotation of thepinion 32 is reversed. This causes the chaser carrying frame to be movedoutward relative to the housing. The first movement in the reversedirection, because of the friction between the frame and the posts 44and sleeve 38, causes the housing to move longitudinally on the barrelagainst the split ring 28, causing the space 29 to again be realizedbetween the ring gear and the flange. This then causes the chasers torecede still further, even though normally the action on removal of thedie would cause the chasers to move inward. Thus, the chasers areimmediately relieved from their pressure against the threads. Continuedmovement in the counter-clockwise direction causes the chasers to bebacked off of the threads, which movement is continued until the chasersare completely out of engagement with the now threaded pipe.

It will be noted that, because of the relative movement possible betweenthe housing and the barrel, and that because the chaser carrier is inthreaded engagement with the barrel, the housing and chaser controllingposts can thus move slightly relative to the ring gear and the chasercarrier. This, as explained, causes an unusual action in that at thestart of the threading operation, when the chasers would normally startreceding, they actually stand still, which starts the cutting actionsooner and conditions the device for the subsequent operation previouslydescribed {where the chasers are actually caused to recede slightly whenthe normal action would be for them to move inward when the chasers arebeing backed ofi. This provides for clean threads which are notmutilated when the chasersjare backed oif of the threads.

It will also be seen that the construction is such'that a greaterdriving force may be appliedjto the chaser carrier because not only dothe posts drive the chaser carrier, but a considerable amount of drivingforce is applied to the chaser carrier by the sleeve 38 at the exact"point-where the greatest force is needed.

Furthermore, the manner in which thesleevc,

pinion and the shaft are assembled in the nous-'- ing provides a strong,simple and economicalv I manner of assembly which allows quickreplacement when necessary or desirable.

The manner in which the housing is assembled.

on the barrel is also quick and economical and enables disassemblywithout the need of special tools and is such that there are no screwsto come loose during operation and become lost.

The two piece construction of the chaser frame provides for accurateeconomical construction and quick and economical replacement of parts.

Having thus described the invention, it is ap-- preciated that numerousand extensive departures may be made therefrom without departing ery ofthe ring gear, chaser posts carried by said housing, a bearing sleeveformed for threaded engagement with said pinion housing and a shaftjournalled in said sleeve and having a pinion thereon adapted fordriving engagement with, v saidring gear, a chaser carrying housingformed with radially extending chaser channels, and

chassis in said channels, a circular recess formed in said housing and athreaded barrel having a flange secured in said recess and closing saidchaser channels, friction means carried by said flange and frictionallyengaging said chasers, said barrel being in threaded engagement withsaid work holder barrel and said chaser posts 6 extending through saidhousing and in control ling engagement with said chasers.

2. A thread cutting tool including a work holder, a ring gear integralwith the work'holder and a barrel extending from said ring gear, ahousing rotatably journalled on said barrel and having a guard portionsurrounding the ring gear, ring means afiixed to said barrel forsecuring the housing on said barrel, a pinion housing formed on saidhousing opposite the periphery of the ring gear, chaser posts carried bysaid housing, a bearing sleeve formed for threaded engagement with saidpinion housing and a shaft journalled in said sleeve and having a pinionthereon adapted for driving engagement with said ring gear, a chasercarrying housing-formed with radially extending chaser channels, andchasers in said channels, a circular recess formed in said housing and athreaded barrel having a flange secured in said recess and closing saidchaser channels, friction means carried by said flange and frictionallyengaging said chasers, said barrel being in threaded engagement withsaid work holder barrel and said chaser posts extending through saidhousing and in controlling engagement with said chasers, said firsthousing being movable longitudinally, on said work holder barrelrelative to the work holder and the chaser holder to move said chasersinto the work at the start of a threading operation and out ofengagement with the work at the end of the cutting operation.

CARL H. INGWER. CLYDE E. WRIGHT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 971,941 Vosper Oct. 4, 19101,052,769 Tewksbury Feb. 11, 1913 1,153,835 Walter Sept. 14, 19151,168,779 Bacon Jan. 18, 1916 1,199,393 Lidke Sept. 26, 1916 1,284,709Koehler Nov. 12, 1918 1,404,996 Nonneman Jan. 31, 1922 1,404,997Nonneman Jan. 31, 1922 1,459,240 Nonneman June 19,, 1923 1,481,191Elliott Jan. 15, 1924 1,616,649 Borden Feb.8, 1927 1,655,072 OsterJan.3, 1928 1,794,806 Tewksbury Mar. 3, 1931 1,808,315 Nonneman June 2,1931 1,852,186 Nonneman Apr. 5, 1932 2,076,831

Thewes Apr. 15, 1937

